Crank-shaft



C. A. KUHN.

CRANK SHAFT.

APPLlCATiON FILED MAY 31, 1918.

1,337,081 Patented Apr. 13, 1920.

2 SHEETS-SHEET I.

1%) in one [are thereof adapted l o reeive the ends ol the weh 15 to whit-h the ring mem be! is attaehed. llau-h ring member is formed with (lOPl'QSSlOlh 21 or otherwise redu eel in weight on either side ol the end of the web 15 adjm-ent the crank pin so that the. ring member will be made lighter at this port ion thereol. 'In the eoustrurtion 0f the shaft just described. the part of eurh ring lueniher opposite the Crank pin should he equal in weight-to the rouibined weight of the rrenk pin. LOlll1 ('tllll rod and hearing therefor. ln the siX pin shaft shown in Fig. 5, the weight of the ring u'ielnher opposite the rrank pin should be equal to the combined weight of the (rank pin. ronnertiug: rod and bearing and one half the weight of the ordinar web or arm 12 and in thi nianuer the parts will be properly balanced.

Tl'ie two innermost webs15 o't' theshatt shown in Fig.5, have their crank pins 11 urrz-inged direetlv opposite earh other and rennet-ted by the web while the e'ank pins of the other Webs are arranged at proper angles with respect toearh other to --e'r1"eetly time the strokes of the different pistons.

What is *lillllltltl is:--

l. A erunk shal't inrluding at pluralityot' (rank pins, webs connerting the pins and having their ends reduced to provide flanges and shoulders the surfaces of whirlrare curved on lines coneentrie with the transverse axes ol the webs, and ring members iuounted upon said webs and engaging said shoulders, the rings having side recesses reeeirirg said flanges and being fixed to the latter.

2. A crank she-ft including a plurality of ('lllllk pins, dianietric bars eonstituting webs eonneeting the pins and having their ends provided with shoulders the surfer-es of which are curved on lines eoncentri with the axis of the shaft, and eonnterbalaneing annular n1eiiilers mountedupon said. webs and engaging said shoulders, said members beingchanneled whereby they are reduced in weight at points adjacent their respective rrank pins.

Tn testimonywhereot T afiix my signature, in the presence of two witnesses.

CLARENCE A. KUHN' Witnesses: ARCHER A. Smart, JOHN WEBER, Jr.' 

